A blessing in disguise( বিপরীতে হিত ; প্রথমে খারাপ হিসেবে মনে হলেও পরবর্তীতে ভালো হয় ) Sam's motorcycle accident was a blessing in disguise because he got enough insurance money.
cringing flatterer( খঁয়ের খা )
By leaps and bounds( অতি দ্রুতগতিতে ) The population of Bangladesh is increasing by leaps and bounds.
Cats and dogs( মূষল ধারে ) It was raining cats and dogs.
At one’s own sweet will( খুশি মতো ) He still does it at his own sweet will.